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191212-50-7

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191212-50-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 191212-50-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,1,2,1 and 2 respectively; the second part has 2 digits, 5 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 191212-50:
(8*1)+(7*9)+(6*1)+(5*2)+(4*1)+(3*2)+(2*5)+(1*0)=107
107 % 10 = 7
So 191212-50-7 is a valid CAS Registry Number.

191212-50-7Relevant articles and documents

Synthesis of (S)- and (R)-sporochnol by using the allylic substitution of the secondary allylic picolinate

Kobayashi, Yuichi,Sugihara, Yusuke,Tojo, Toshifumi,Ozaki, Takuri

, p. 47 - 54 (2016)

The allylic substitution of secondary allylic picolinates and copper reagents for the construction of a quaternary carbon was applied to synthesis of sporochnol. The enantiomerically enriched allylic picolinate (R)-5 was synthesized through the asymmetric hydrogen transfer of acetylene ketone 11 and the Pd-catalyzed methylation of the iodoallylic alcohol 16a. The key allylic substitution of the allylic picolinate (R)-5 with 4-MeOC6H4MgBr/Cu(acac)2 (2:1) proceeded with 95% chirality transfer with 98% regioselectivity to afford anti SN2' product 6 in 89% yield, which was converted to the methyl ether of unnatural (R)-sporochnol. Similarly, the methyl ether of (S)-sporochnol (the natural form) was synthesized.

Quaternary carbon stereogenic centers through copper-catalyzed enantioselective allylic substitutions with readily accessible aryl- or heteroaryllithium reagents and aluminum chlorides

Gao, Fang,Lee, Yunmi,Mandai, Kyoko,Hoveyda, Amir H.

supporting information; experimental part, p. 8370 - 8374 (2010/12/25)

The case of the notorious aryls is solved: The first efficient catalytic and enantioselective method for allylic substitutions that furnish quaternary carbon stereogenic centers by additions of aryl- or heteroarylmetals is reported (see scheme). Highly site- and enantioselective processes begin with readily available organolithium reagents.

The absolute configuration of (+)-sporochnol A, the fish deterrent from the Caribbean marine alga Sporochnus bolleanus

Takahashi, Michiyasu,Shioura, Yoko,Murakami, Taku,Ogasawara, Kunio

, p. 1235 - 1242 (2007/10/03)

The absolute configuration of (+)-sporochnol A, the fish deterrent from the Caribbean marine alga Sporochnus bolleanus, has been established as S based on the stereocontrolled synthesis of its (R)-(-)-enantiomer from (S)-epichlorohydrin.

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